(adsbygoogle = window.adsbygoogle || []).push({}); PER - chemical reaction

Q: A reactor is needed to convert A to R in a liquid reaction. The stoichiomentry is simply A→R and the rate data is given in the table below (P5.21, Levenspiel 1999).

For the reactant concentration to drop from CA0 = 1.3 mol/L to CAf =0.3 mol/L, determine,

a) the time required with a batch reactor. (ans: 10.21 min).

b) the volume required for a flow reactor to achieve the same conversion as in (a) and at

a feeding rate of A 1000 mol/h in (1) a PFR, and (2) a CSTR. (ans: PFR V= 130.8 L;

CSTR V = 25.6 L).

c) the volumes of two flow reactors in series with the exit concentration of A from the 1st

reactor xA1= 0.231 (i.e. CA1= 1 mol/L) for (1) 1st PFR +2nd CSTR, and (2) 1st CSTR

+2nd PFR. For both cases, sketch the area for each reactor in the 1/rA-xA plot. (ans: 1,

V1= 38.7 L,V2 17.9 L; 2, V1= 77.0 L, V2 = 85.4 L).

Hints: Plot 1/rA vs. xA, calculate the area under the line, either by measuring the graphical

area or by integration of the trend line equation (which should be a 5th order polynomial).

-------------------

This time, I cannot solve question (C).

I can only calculate the part of CSTR.

For the PER in case (1):

(1000/60)(5.0244) (5.0244 is the area that from xA=0 to 0.230769, 1000/60 is the flow rate from part (B))

=83.74L

My answer is wrong, but I don't know what's wrong with my calculation

**Physics Forums | Science Articles, Homework Help, Discussion**

Dismiss Notice

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Chemical reactors - reaction

**Physics Forums | Science Articles, Homework Help, Discussion**